| 摘要 |
<P>PROBLEM TO BE SOLVED: To perform developing operation at an always accurate position at the time of printing operation in an image forming apparatus having a rotary developing device holder for holding a plurality of developing devices. <P>SOLUTION: In the image forming apparatus having the rotary developing device holder for holding a plurality of developing devices and capable of judging the position of the developing device holder from an output of a sensor for detecting the rotation quantity of a motor for driving the developing device holder through a gear and an output of a sensor for detecting a reference position of the developing device holder, the reference position of the developing device holder is detected again after setting all the developing devices. When developing device detection is performed without opening a developing device replacing door after setting the reference position and the existence of all the developing devices is determined, second origin detection is omitted. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
